Accidentally Finding The Issue With a Donkey Kong PCB

Accidentally found the issue by putting my hand the pcb.

[@jerryvoluptuous9543]

Well done sir!🎉

[@tigheklory]

It's always 7400 LS chips that go bad it seems. Sounds like you need to rebuild that sound amp board on that monitor.

[@SNESCUBE64]

My audio setup isn't ideal for donkey kong, for the bench I use a mikes arcade jamma adapter. The monitor is a 9" hantarex. Both get the job done and are perfectly acceptable for a test bench setup.